XC9120/9121/9122 Series are PWM, PWM/PFM auto/external switching controlled step-up DC/DC converter controller ICs. With a maximum duty ratio of 93%, they are suitable for applications with high step-up ratios, such as LCD panels and OLED. Even with high step-up ratios, this series can achieve stable output voltage with high efficiency. The internal reference voltage supply is 0.9V (±2.0%), and the output voltage can be freely set within a range of 1.5V to 30V using external resistors RFB1 and RFB2.